The Amino Acids

Question 1

Alanine

Answer 1

Ala, A

(GC-)

Aliphatic

Question 2

Arginine

Answer 2

Arg, R

(AGA) (AGG) (CG-)

Basic

pKa of ionizing side chain = 12.5

Question 3

Asparagine

Answer 3

Asn, N

(AAC) (AAU)

Acidic

Question 4

Aspartic acid

Answer 4

Asp, D

(GAC) (GAU)

Acidic

pKa of ionizing side chain = 3.9

Question 5

Cysteine

Answer 5

Cys, C

(UGC) (UGU)

Sulfur, S-H

pKa of ionizing side chain = 8.3

Question 6

Glutamic acid

Answer 6

Glu, E

(GAA) (GAG)

Acidic

4.2

Question 7

Glutamine

Answer 7

Gln, Q

(CAA) (CAG)

Acidic

Question 8

Glycine

Answer 8

Gly, G

(GG-)

Aliphatic

Question 9

Histidine

Answer 9

His, H

(CAC) (CAU)

Basic

pKa of ionizing side chain = 6.0

Question 10

Isoleucine

Answer 10

Ile, I

(AUA) (AUC) (AUU)

Aliphatic

Question 11

Leucine

Answer 11

Leu, L

(CU-) (UUA) (UUG)

Aliphatic

Question 12

Lysine

Answer 12

Lys, K

(AAA) (AAG)

Basic

pKa of ionizing side chain = 10.0

Question 13

Methionine

Answer 13

Met, M

(AUG)

Sulfur

Question 14

Phenylalanine

Answer 14

Phe, F

(UUC) (UUU)

Aromatic

Question 15

Proline

Answer 15

Pro, P

(CC-)

Cyclic

Question 16

Serine

Answer 16

Ser, S

(AGC) (AGU) (UC-)

Alcohol

Question 17

Threonine

Answer 17

Thr, T

(AC-)

Alcohol

Question 18

Tryptophan

Answer 18

Trp, W

(UGG)

Aromatic

Question 19

Tyrosine

Answer 19

Tyr, Y

(UAC) (UAU)

Aromatic

pKa of ionizing side chain = 10.1

Question 20

Valine

Answer 20

Val, V

(GU-)

Aliphatic

Question 21

Alipathic Amino Acids

Answer 21

(less hydrophobic) G, A, V, L, I (more hypdrophobic)

Question 22

Amino Acids with Hydroxyl- or Sulfur-Containing Side Chains

Answer 22

S, C, T, M, Y

Question 23

Aromatic Amino Acids

Answer 23

F, Y, W

Question 24

Basic Amino Acids

Answer 24

H, K, R

Question 25

Acidic Amino Acids and Their Amides

Answer 25

D, E, N, Q

Question 26

pKa of alpha-COOH group

Answer 26

1.8 - 2.3

Question 27

pKa of alpha-NH3+ group

Answer 27

8.8 - 10.8